While this term isn't something you'd probably be diagnosed with by your friendly neighborhood ophthalmologist, I'm here to tell you it's a very real concept. I should know, because my seven-year-old grandson, Joshua, told me.
This afternoon he was on my porch and came running in to ask for some salt. "Grandma, you have a whole bunch of slugs out there!" I was afraid he'd dump the entire salt box on the critters, so I went outside with him. The slugs on the porch and walkway were easy for me to see, but Joshua explained that there were some hiding in amongst my flowers. I could see their slimy trails, but not the dreaded bodies themselves. He tried his best to point them out to me. "Up there, Grandma, between those two flowers. More to the right." Most times I'd eventually see what he was talking about, but I think there were a few that got away because I couldn't see them. "Joshua, you're really good at spotting those," I said. He replied, "That's because I've got slug vision!"
His response has stuck with me all afternoon. Our sin can be like a slug. It's small, ugly, and out to ruin the growth taking place in our lives. If we ignore it, it will only get bigger and cause more damage. But in all honesty, sometimes we're not able to see it ourselves--it takes someone else to point it out to us.
Jesus said we're the salt of the earth. I've always heard that salt helps to preserve and give flavor, but I think there's another benefit of it too. Just as a light sprinkling of salt will eradicate the slug, so our lives should help eliminate the sin around us.
May we all have someone in our lives with the gift of slug vision!